PLANTS OF SOUTHERN NEW JERSEY. 733 



ee. Bracts of the involucre obtuse. Leaves linear, crowded 

 usually entire, obtuse. B. hyssopifolium, p. 735 



dd. Leaves rounded, obtuse or truncate at the base. 



e. Plant glabrous, leaves lanceolate, long acuminate. 



B. sessilifoliiim, p. 736 

 ee. Plants pubescent, leaves ovate or oblong, acute or obtuse. 

 /. Leaves ovate-oblong to lanceolate, mostly rounded at 

 the base, usually obtuse, roughish pubescent. 



B. verbencefolium, p. 735 

 //. Leaves roundish ovate, obtuse, truncate at base, 

 downy pubescent, crenate dentate. 



B. rotundifoliunv, p. 736 

 ///. Leaves ovate, acute, strongly serrate, pubescent. 



B. pubescens, p. 736 



Eupatorium purpureum L. Joe-pye Weed. 



Bupatorium purpureum Linnaeus, Sp. PI. 838. 1753 [North America]. — 

 Knieskern 17. — Britton 128. 



Frequent in low open ground and thickets in the northern 

 counties and less common southward in the Middle and Coast 

 districts. 



This is the common Joe-pye weed of the uplands of south- 

 eastern Pennsylvania. The typical plant is tall, 16—10 feet, with 

 narrower, often falcate, leaves ; crenate, glabrous above and but 

 little veined below, stem glaucous, inflorescence high and rounded 

 on top, flowers pale pink. 



The following species, by far the commoner in our region, 

 is low, averaging 3-4 feet ; leaves coarsely dentate, shorter and 

 much broader, scabrous above, very strongly veined beneath, 

 inflorescence flat-topped, flowers deep crimson. Specimens 

 growing in shade have the leaves smooth, or nearly so, and are 

 thus intermediate. Possibly the two should be regarded as 

 only subspecifically different, but the extremes are easily sepa- 

 rable and the non-typical character of most herbariumi material 

 makes it difficult to draw conslusions from it. 



Fl. — Mid-August through September. 



Middle District. — Hartford, Mouth of Coopers Creek, W. Deptford, Black- 

 wood, Medford (S), Beaver Dam. 

 Coast Strip. — Palermo. 



Eupatorium maculatum L. Spotted Joe-pye Weed. 



Bupatorium maculatum Linnaeus, Amoen. Acad. IV. 288. 1755 [North 



America]. 

 Bupatorium purpureum var. maculatum Britton 128. 



